Please add
# Brother MFC640CW
ATTRS{idVendor}=="04f9", ATTRS{idProduct}=="0197", ENV{libsane_matched}="yes"
to /lib/udev/rules.d/libsane.rules
Reply to my email. I'm not subscribed to sane-devel
bye
--
Marco Ciampa
+--------------------+
| Linux User #78271 |
| FSFE fellow #364 |
+--------------------+